For standard adult CPR, give 30 chest compressions in each cycle , followed by 2 rescue breaths, at a rate of about 100–120 compressions per minute.

Core CPR Numbers

  • Adults and older children: 30 chest compressions, then 2 rescue breaths (a 30:2 ratio).
  • Rate: 100–120 compressions per minute, pushing hard and fast in the center of the chest.
  • Keep repeating 30 compressions and 2 breaths until the person breathes, someone takes over, or emergency help arrives.

Age-specific quick guide

  • Adults: 30 compressions then 2 breaths, depth about 2 inches (5–6 cm).
  • Children: Same 30:2 ratio for a single rescuer; depth about 2 inches.
  • Infants: 30:2 for a single rescuer; depth about 1.5 inches, using two fingers or the two‑thumb technique.

Hands-only CPR note

  • If you are not trained in rescue breaths, you can do continuous chest compressions at 100–120 per minute with no breaths until help arrives.
  • Compression‑only CPR is recommended for untrained bystanders in adults who suddenly collapse and is much better than doing nothing.

Information gathered from public forums or data available on the internet and portrayed here.